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Last-ditch maximum size limit for Signpost

This makes sure that width * height <= INT_MAX, which it rather needs
to be.

--- a/signpost.c

+++ b/signpost.c

@@ -7,6 +7,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -421,6 +422,8 @@

 {

     if (params->w < 1) return "Width must be at least one";

     if (params->h < 1) return "Height must be at least one";

+    if (params->w > INT_MAX / params->h)

+        return "Width times height must not be unreasonably large";

     if (full && params->w == 1 && params->h == 1)

 	/* The UI doesn't let us move these from unsolved to solved,

 	 * so we disallow generating (but not playing) them. */